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Mitchell & Johnson 800 SERIES, Owner'S Handbook Manual

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Mitchell & Johnson 800 SERIES Owner'S Handbook Manual Download Page 28

28 

Mitchell & Johnson Limited, 

16, Severn Farm Industrial Estate,  

Welshpool, Montgomeryshire,  

Wales, UK, SY21 7DF 

email: [email protected]        

Web: www.mitchellandjohnson.com 

Summary of Contents for 800 SERIES

Page 1: ...800 SERIES PRE POWER AMPLIFIER OWNERS HANDBOOK Made in the UK Made in the UK Made in the UK Made in the UK ...

Page 2: ...verview and Input Connections 10 Balanced Connections 11 Output Connections Cables 12 Front Panel Operation 13 Remote Control 14 Setup Menu Options 15 to 18 USB Audio 19 to 20 Pre Amplifier Specifications 21 POWER AMPLIFIER INSTRUCTIONS 22 Rear Panel 23 Front Panel 24 Overview and Input Connections 25 Output Connections 26 Power Amplifier Specifications 27 Rear cover and Contact details 28 ...

Page 3: ...3 PLEASE RETAIN YOUR ORIGINAL PURCHASE RECEIPT AND PLACE IT HERE FOR SAFEKEEPING YOUR WARRANTY PERIOD WILL COMMENCE FROM THE DATE OF PURCHASE SHOWN ON THE RECEIPT Warranty ...

Page 4: ...60065 2002 Electrical Safety Requirements EN60065 2002 IEC60065 2001 BS EN 55020 2002 EMC Immunity EN55020 2002 CISPR 20 2002 BS EN 55013 2001 EMC Emissions EN55013 2001 CISPR 12 2001 BS EN 61000 3 2 2001 EMC Limits for Harmonic Emissions EN61000 3 2 2000 IEC61000 3 2 2000 BS EN 61000 3 3 1995 EMC Limits for Voltage Fluctuations EN61000 3 3 1995 IEC61000 3 3 1994 I hereby declare that the equipmen...

Page 5: ... has been optimised to a negligible level Contrary to popular audio phile practice we do not recommend leaving our power amplifiers permanently powered All Mitchell Johnson amplifiers have been designed to attain full operational specifications and sound quality within a few minutes of switch on Mitchell Johnson operates a 100 recycling program All waste materials generated as part of the manufact...

Page 6: ...d plant on top of the units or allow drinks to be placed near the units If liquid is spilt in to the cabinet remove the mains leads from the wall immediately The products should then be returned to your dealer for safety testing before re use Failure to do so may result in electric shock or even fire Do not use the units in damp conditions for example outside of the house In the event of an electr...

Page 7: ...7 800 SERIES PRE AMPLIFIER INSTRUCTIONS ...

Page 8: ...bwoofer system Analogue Unbalanced Inputs Labelled 1 to 4 The displayed name for each input can be edited in the setup menu Phono input Selectable MM MC In user setup menu Rear Panel Phono Ground Connect turntable Ground here if fitted Balanced inputs Devices such as balanced output CD players can be connected here Connections comply with European standard pin polarity wiring Serial Number Safety ...

Page 9: ...o regulate the amplifiers volume The volume level is shown on the main display Pushing the volume knob will enable the menu page for cus tomising the user settings See page 15 for details Headphones 6 35mm output socket for integrated headphone amplifier Headphone impedance should be a minimum of 32 Ohms Front Panel Infra red receiver Both the volume knob and the Source knob incorporate a push swi...

Page 10: ...ith either a Moving Magnet or a Moving Coil cartridge The relevant setting is accessible in the setup menu Digital Optical 1 3 Optical connections are commonly used on televisions games machines and satellite television receivers to transfer digital audio information from one component to another The main benefit of optical connections is that there is no direct earth connection between units ther...

Page 11: ...t plus phase The two signals are then added together to produce the original source signal However any noise or hum induced in the cable is effectively cancelled out Other than greater noise rejection there is no inherent advantage to be gained by using balanced connectors in a domestic setting unless the two connected devices are placed several meters apart in which case there would almost defini...

Page 12: ...e REC OUT This is a direct output before the volume control specifically for recording purposes or for sending a feed to a second room with a second amplifier setup This output is not volume controlled so take care when connecting components to this output SUB OUT Stereo outputs are provided to enable dual active subwoofers to be used Multiple subwoofers give much better room coverage and ultimate...

Page 13: ... clicks then restore to a low level to avoid speaker damage The low level input change function can be defeated in the setup menu When AV direct is selected on the remote control the volume initially returns to a low level then slowly ramps up to a pre set level for control via the AV processor The volume can be manually overridden at any time by turning the volume knob or by pushing either of the...

Page 14: ... to its previous set ting INPUT The input buttons select the pre allocated input sources as shown on page 15 VOLUME Two buttons for up and for down control the volume Short presses on the VOLUME buttons will change the volume in small increments Press and hold the volume or buttons to smoothly raise or lower the vol ume The CD control buttons allow control of various functions on a Leema CD play e...

Page 15: ...s as the home theatre input The HT volume only ramps up to fixed unity gain when HT mode is enabled from the re mote control or from the input selection knob 2 INPUT VOLUME DROP Options 1 Volume drops to a low safe level when an input source is changed 2 Volume remains at the current set level when an input source is changed Explanation Mitchell Johnson pre amplifier has a large number of inputs i...

Page 16: ...se lected level in normal operation 4 SET LCD OFF TIMER Options 1 LCD ALWAYS ON 2 OFF IN 5 SECONDS 3 OFF IN 10 SECONDS 4 OFF IN 30 SECONDS Explanation The LCD display can be set to automatically turn off after a preset period of time following a command such as changing input or adjusting the volume The display will reactivate upon such an action then turn off following the preset period defined i...

Page 17: ...put name to be edited again press the select button The display will now show EDIT input name ALIAS Original name Notice that the first letter of the input name is flashing as a block To change the letter press select The letter will now be underlined Rotating the INPUT NAV Knob will scroll through the available letters and symbols These are ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 When the required l...

Page 18: ... names Option 3 will reset all menu options and reset input names to defaults 7 Phone Cartridge Selection Options 1 Moving Magnet Cartridge 2 Moving Coil Cartridge Explanation There are two types of phono cartridge in common circulation Moving Magnet and Moving Coil Moving Coil cartridges have a very low output voltage which requires an extra gain stage to be switched in to the circuit This can be...

Page 19: ...io though the M J unit will have to be selected as the audio player in the computer settings Windows 10 creators update also has the XMOS driver embedded Earlier versions of Windows will require a driver but we strongly recommend using Windows 10 for high speed audio playback If using an earlier version of Windows please contact Mitchell Johnson for advice ...

Page 20: ...ollow this variable data rate This is not a suitable method for producing high quality audio since it results in high jitter which in turn results in high distortion Asynchronous USB playback requires the DAC to accurately regulate the data output speed of the computer to practically eliminate jitter based distortion In practice this is a very complex task and requires the computer to have a free ...

Page 21: ...Plus DSD1X and 2X Phono input Moving magnet gain 36dB Moving coil gain 62dB Frequency response 0 1dB ref RIAA curve 20Hz to 20khz Load characteristics Moving magnet 47k Ohm 100pF Load characteristics Moving coil 90 Ohms 1nF Input sensitivity Moving magnet 4mV RMS for 250mV RMS out at 1kHz Input sensitivity Moving coil 180uV RMS for 250mV RMS out at 1kHz Headroom Greater than 26dB at 1kHz Specifica...

Page 22: ...22 800 SERIES POWER AMPLIFIER INSTRUCTIONS ...

Page 23: ...nput Left From Pre Amplifier Connections comply with European standard pin polarity wiring 12 volt power links Used to link units together for synchronised on off Balanced input Right From Pre Amplifier Connections comply with European standard pin polarity wiring Analogue Output Right Use for Bi Wiring Analogue Input Right From Pre Amplifier Analogue Input Left From Pre Amplifier Speaker Terminal...

Page 24: ...24 Power on off Switch Output Level Meters Front Panel Standby Light ...

Page 25: ... amplifiers output in real time Connections Input Connections Analogue The Mitchell Johnson 800 series power amplifiers analogue inputs should only be connected to the analogue outputs usually marked left right and colour coded white red from a source component such as a pre amplifier that has volume control Balanced High end sources often feature this kind of connection It does not offer any inhe...

Page 26: ...er They accept 4mm banana type plugs suitable spade connectors or bare wires Pay close attention to polarity The red amplifier terminal must connect to the red terminal on the loudspeaker and the black amplifier terminal to the black loudspeaker terminal Dual terminals are provided to allow for easy bi wiring Two sets of loudspeaker cables will be re quired Simply connect the bottom pair of termin...

Page 27: ...hted volume control minimum 100dBm Signal to Noise ratio A weighted ref 285 Watts RMS 4 ohms 104dB THD 10 Watts RMS 4 ohms 1KHz 0 006 THD Max output before clipping 4 ohms 1KHz 0 006 Maximum DC offset 50mV Sensitivity for maximum output CD input 565mV RMS Sensitivity for maximum output other inputs 311mV RMS Output Impedance 0 05 ohms Damping Factor 8 ohms 160 Weight 16kg Specifications subject to...

Page 28: ...28 Mitchell Johnson Limited 16 Severn Farm Industrial Estate Welshpool Montgomeryshire Wales UK SY21 7DF email info mitchellandjohnson com Web www mitchellandjohnson com ...

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